Why doesnt my motor make power?
#1
Why doesnt my motor make power?
Ok... I have an LQ9 in my 2nd gen Camaro. The spec of the car and motor is in my signature.
Thing is it doesn't perform any where near like I think it should or compared to others.
My best run in the car is in this video. 13.08@103.44 with 1.80 60' (street tyres). I've run faster at 105.4, but higher ET. I was expecting the mph number to be more like 112/114.
The ECU is megasquirt 3. Ignition advance is 25deg from 2200rpm up. Compression ratio is 10.5:1 WOT AFR is stable at 12.6/12.7
I've verified the advance with a timing light and know it's correct. I've also checked cam timing.
Anyone with any input of where I should look?
Thing is it doesn't perform any where near like I think it should or compared to others.
My best run in the car is in this video. 13.08@103.44 with 1.80 60' (street tyres). I've run faster at 105.4, but higher ET. I was expecting the mph number to be more like 112/114.
The ECU is megasquirt 3. Ignition advance is 25deg from 2200rpm up. Compression ratio is 10.5:1 WOT AFR is stable at 12.6/12.7
I've verified the advance with a timing light and know it's correct. I've also checked cam timing.
Anyone with any input of where I should look?
#4
Stainless long tube headers with 1 7/8" primaries. Rest of it was 2.5" with x-pipe and thrush mufflers. I've just ripped that out and fitted a 3" pypes system with race pro mufflers. Haven't run it with that yet to see if there's any difference.
Intake is a sheet metal one, same as the TSP one. 102mm throttle body. And it definitely gets full throttle.
Converter is an FTI SRLT 4000rpm stall hard hit.
Intake is a sheet metal one, same as the TSP one. 102mm throttle body. And it definitely gets full throttle.
Converter is an FTI SRLT 4000rpm stall hard hit.
#6
I'm completely stumped...
It sounds healthy and runs OK. I've bumped the ignition timing up to 27 deg ready for my first pass tomorrow. My last was at 25. I went out on a local private road and did some playing. The shot below is from the datalog. AFR at 12.7, 26.9 deg advance.
When I got home I puled #1 plug to have a look. Large image in the link below.
http://s5.photobucket.com/user/flak_...dmfio.jpg.html
It sounds healthy and runs OK. I've bumped the ignition timing up to 27 deg ready for my first pass tomorrow. My last was at 25. I went out on a local private road and did some playing. The shot below is from the datalog. AFR at 12.7, 26.9 deg advance.
When I got home I puled #1 plug to have a look. Large image in the link below.
http://s5.photobucket.com/user/flak_...dmfio.jpg.html
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#8
I found some of that missing power....
Best run today:
12.24@111.38
That's with a 1.77 60', lots of wheel hop and street tyres.
I gradually increased the timing over 6 runs, 1 degree at at time until I stopped picking up speed and then backed it off a degree.
My first run with the timing table I previously posted was 13.12@108.30 but I had 20yds of wheel spin out of the hole.
I saw steady increases in the MPH as I increased the advance. It's now 30deg from 3500rpm and up and it seems to be OK...
I'll post a video of the run when it's uploaded
Best run today:
12.24@111.38
That's with a 1.77 60', lots of wheel hop and street tyres.
I gradually increased the timing over 6 runs, 1 degree at at time until I stopped picking up speed and then backed it off a degree.
My first run with the timing table I previously posted was 13.12@108.30 but I had 20yds of wheel spin out of the hole.
I saw steady increases in the MPH as I increased the advance. It's now 30deg from 3500rpm and up and it seems to be OK...
I'll post a video of the run when it's uploaded
#11
Started at 24 deg and ended up at 30 deg for the quickest run. Also fitted a 3" exhaust system with turbo style mufflers rather than the 2.5" chambered ones I had previously fitted.
My AFR is a bit low at 12.4, so pulling a bit of fuel out of the VE table should help pick up a few more MPH.
My AFR is a bit low at 12.4, so pulling a bit of fuel out of the VE table should help pick up a few more MPH.